EP1661538B1 - Saugfähiger einwegartikel und herstellungsverfahren dafür - Google Patents

Saugfähiger einwegartikel und herstellungsverfahren dafür Download PDF

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Publication number
EP1661538B1
EP1661538B1 EP04771892.9A EP04771892A EP1661538B1 EP 1661538 B1 EP1661538 B1 EP 1661538B1 EP 04771892 A EP04771892 A EP 04771892A EP 1661538 B1 EP1661538 B1 EP 1661538B1
Authority
EP
European Patent Office
Prior art keywords
zones
elastic members
article
set forth
waist region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP04771892.9A
Other languages
English (en)
French (fr)
Other versions
EP1661538A4 (de
EP1661538A1 (de
Inventor
Toshifumi Uni-Charm Co. Ltd. OTSUBO
Hiroki Uni-Charm Co. Ltd. YAMAMOTO
Tomoko Uni-Charm Co. Ltd. SUGITO
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Unicharm Corp
Original Assignee
Unicharm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Unicharm Corp filed Critical Unicharm Corp
Publication of EP1661538A1 publication Critical patent/EP1661538A1/de
Publication of EP1661538A4 publication Critical patent/EP1661538A4/de
Application granted granted Critical
Publication of EP1661538B1 publication Critical patent/EP1661538B1/de
Anticipated expiration legal-status Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56—Supporting or fastening means
    • A61F13/62—Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56—Supporting or fastening means
    • A61F13/5622—Supporting or fastening means specially adapted for diapers or the like
    • A61F13/565—Supporting or fastening means specially adapted for diapers or the like pants type diaper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/56—Supporting or fastening means
    • A61F13/5622—Supporting or fastening means specially adapted for diapers or the like
    • A61F13/565—Supporting or fastening means specially adapted for diapers or the like pants type diaper
    • A61F13/5655—Supporting or fastening means specially adapted for diapers or the like pants type diaper adjustable pants type diapers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • A61F2013/49025—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material having multiple elastic strands
    • A61F2013/49028—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material having multiple elastic strands with different tensile stress

Definitions

  • the present invention relates to a disposable absorbent article used for absorption and containment of body wastes and to a method of making the same.
  • the invention particularly relates to a disposable absorbent article such as an open or pull-on type diaper for an infant or incontinent patient or training pants and a method of making the same.
  • the invention particularly to a method comprising the step of attaching waist-surrounding elastic members to a base sheet functioning to support an absorbent panel and to hold this in close contact with a wearer's body.
  • PATENT DOCUMENT 1 relating to an absorbent article such as a disposable diaper discloses a structure comprising a plurality of elastic members provided in a rear waist region of the article and fastener means detachably connecting the rear waist region with a front waist region of the article wherein the fastener means are fixed to the rear waist region so as to overlap the elastic members.
  • PATENT DOCUMENT 2 relating to a disposable diaper discloses a structure comprising front and rear waist regions previously connected to each other so that the diaper may be selectively used as an open or pull-on type diaper, elastic members attached to front and rear waist regions, respectively, a pair of fastener means attached to transversely opposite side edge portions of the front waist region, respectively, another fastener means attached to the rear waist region so as to cooperate with those on the front waist region and a pair of tear off lines provided along the transversely opposite side edge portions of the front waist region, respectively, so that, if desired, the front waist region can be torn off from the rear waist region.
  • PATENT DOCUMENT 1 WO 01/13843 A1
  • PATENT DOCUMENT 2 Japanese Patent No. 3096152
  • the fastener means are fixed to the rear waist region so as to overlap the elastic members, so the fastener means are formed with gathers as the elastic members contracts. Such gathers make it difficult to bring the fastener means in a firm engagement with a landing zone and an unstable engagement is accompanied with a problem that the fastener means may be unintentionally disengaged from the landing zone.
  • the elastic members are distributed over the part of the waist region to be provided with the fastener means. While it is technically possible to provide the waist region partially with the elastic members, such a measure is not suitable for a mechanical apparatus driven at a high speed to mass produce the article as described herein at a low cost. For this reason, in generally, the elastic members are provided along a full length of a waist-surrounding circumference and the fastener means are attached to the waist region so as to overlap these elastic members.
  • the front waist region is provided along its transversely opposite side edge portions with a pair of tear off lines, respectively, along which the front waist region are torn off from the rear waist region.
  • these waist regions are formed by a nonwoven fabric made of staple fibers or continuous filaments of synthetic resin as this is usually the case and particularly such a nonwoven fabric contains fibers or filaments oriented to cross the tear off direction defined by the tear off lines, it is difficult to tear the front waist region off from the rear waist region.
  • Prior art EP 1 226 802 A2 discloses a disposable diaper comprising a pair of fastening tapes provided on each side edge of the main body, the waist opening portion and the under-waist portion.
  • the portion having the fastening tapes being provided with a waist plastic member and a plurality of under-waist elastic members, respectively, in the width direction of the diaper.
  • the under-waist elastic members are fixedly disposed in areas extending outwardly from each longer side of the absorbent member in their stretched state so as to manifest elastic contractibility but are not disposed in the middle of the area where the absorbent member exists. It is an object of the present invention to provide a disposable absorbent article adapted to solve the problem as has been described above and a method of making the same. It is another object of the present invention to provide a disposable absorbent article including a fastener means adapted to be free from the affection of elastic members even when these elastic members contract and a method of making the same. It is still another object of the present invention to provide a disposable absorbent article having front and rear waist regions previously connected with each other and adapted to be easily torn off from one another, if desired, and a method of making the same.
  • chassis refers to a main body of an absorbent article.
  • the chassis is formed from a material differing from the material for the main body in the conventional disposable absorbent article and components such as tape-like tabs attached to transversely opposite side edge portions of the main body so as to extend outward from these side edge portions do not correspond to the transversely opposite side edge portions of the chassis according to the present invention.
  • the fastener means do not include a fastener means provided on such tabs.
  • the term “elasticized” refers to a state that elastic members have been provided in desired regions made of a material having no rubber elasticity and thereby such regions have been imparted with elastic contractility.
  • the term "inelasticized” refers to a state that the elastic members were provided in desired regions but subsequent treatment has made these regions as if none of the elastic members are present in these regions or refers to a state that, even though the elastic member are present in those regions, the elastic members in the relevant regions have been deprived of contractility required for the article by subsequent treatment.
  • fastener means refers to a means having function substantially the same as those well known in the name of Velcro (trademark) or Magic Tape (trademark) .
  • fastener means refers to the means comprising a hook member consisting of a hook backing and a plurality of hook elements extending upward from the hook backing and a loop member consisting of a loop backing and a plurality of loop elements projecting or standing out from the loop backing so that these hook and loop members may be releasably engaged with each other.
  • the material having a loop function such as a fibrous nonwoven fabric constituting the article may be used as the loop member. It is also possible to replace the hook member and the loop member by an adhesive applied directly or indirectly on the chassis as "fastener means”.
  • first waist region refers to one of the front and rear waist regions of the article and the term “second waist region” refers to the other of the front and rear waist regions.
  • a disposable absorbent article comprising: an absorbent chassis having a first waist region; a second waist region; a crotch region extending between these waist regions; leg region extending on transversely opposite sides of the crotch region; of the first and second waist regions, at least the first waist region being provided with a first elastic means adapted to operate in a waist-surrounding direction of a wearer; the leg regions being provided with a second elastic means adapted to operate in a leg-surrounding direction of the wearer; the first waist region being provided along transversely opposite side edge portions thereof with a fastener means adapted to releasably connect the first to the second waist regions.
  • the improvement according to the present invention is in that the first waist region has an elasticized intermediate zone and inelasticized transversely opposite side edge zones in which the fastener means are attached to the first waist region, and wherein in the inelasticized zones the elastic means in said zones have been deprived of contractility by subsequent treatment.
  • the first and/or second waist region(s) is or are divided into the elasticized intermediate zone and inelasticized transversely opposite side edge zones in which the fastener means are provided.
  • Such a unique arrangement is effective to protect the fastener means from undulation due to contraction of the elastic members laid to elasticize at least the waist regions and, in consequence, proper engagement between the cooperating fastener means is assured. In this way, there is no anxiety that the fastener means might be affected or deteriorated by contraction of the elastic members and unintentionally disengaged from each other as has been described above in the paragraph regarding the prior art.
  • the fastener means are attached to the first waist region in the transversely opposite side edge zones preferably through the intermediary of reinforcing layers made of material provided separately of the first waist region.
  • the reinforcing layers are effective to avoid undesirable deformation and breakage of zones in the fastener means are located and to stabilize mutual engagement of these fastener means.
  • the chassis comprises a flexible and liquid-resistant base sheet having inner and outer surfaces and a semirigid absorbent panel fixed to the inner surface.
  • a flexible and liquid-resistant base sheet having inner and outer surfaces and a semirigid absorbent panel fixed to the inner surface.
  • Such an arrangement is effective to enhance a good fit to the wearer's body, to prevent body waste from leaking, to protect the wearer from experiencing a feeling of discomfort due to stiffness of the article and to prevent the chassis and the absorbent panel from unintentionally moving relatively to each other.
  • the base sheet comprises a laminate sheet composed of at least two sheets intermittently bonded together and the first and second elastic means are interposed between said two sheets.
  • Such an arrangement is effective to ensure a tensile and tear strength required for the base sheet and to reliably fix the elastic members to the base sheet.
  • the first elastic means are provided substantially over a whole area of the intermediate zone and the first and second elastic means comprise a plurality of thread- or strand-like means having rubber elasticity.
  • Such an arrangement is effective to hold the first and second waist regions around the wearer's waist over a relatively wide range without giving the wearer oppressive feeling.
  • the fastener means comprise a mechanical fasteners or adhesive fastener directly or indirectly applied on the chassis in desired regions thereof and are continuously or intermittently provided on the first waist region over a range defined between end portions opposed in a vertical direction of the chassis.
  • Such an arrangement is effective, particularly when the article has a structure by which the first and second waist regions are detachably connected with each other, to ensure that a tensile force with which the wearer's parent or care personnel pulls the first and/or second waist region(s) with the transversely opposite side edge portions thereof held in the hands can be transmitted to a generally whole area of the waist region(s), to facilitate the wearer's parent or care personnel to put the article on the wearer's body, to assure a wide area of engagement and thereby to improve a strength of engagement.
  • the first and second elastic means comprise a plurality of elastic members and longitudinally opposite ends of the elastic members are laid in the vicinity of side edges of the fastener means and oriented so as to cross these side edges.
  • Such an arrangement allows the first and second elastic members to be operatively associated or to cooperate with each other.
  • a contraction stress of the first elastic members are operatively associated with a contraction stress of the second elastic members.
  • the waist regions are elastically pressed against the wearer's waist at an appropriate pressure
  • the leg regions also will be elastically pressed against the wearer's legs at an appropriate pressure.
  • the article is an open type diaper or a pull-on type diaper.
  • a process for making the article comprises the steps of feeding a plurality of continuous elastic members extending in parallel to and spaced from one another, onto a continuous web destined to form individual base sheets constituting the chassis so as to be fixed to a first zone of the web corresponding to the intermediate zone and treating the elastic members lying in second zones of the web corresponding to the transversely opposite side edge zones to be inelasticized.
  • Such an arrangement facilitates the objects of the invention to be achieved.
  • the step of inelasticizing the elastic members lying in the second zones further includes a step of fixing the elastic members lying in the second zones to the second zone and then cutting the elastic members lying on a boundary line between the second zones adjacent to each other along the boundary line so as to cause the elastic members lying in the second zones to snap back.
  • Such an arrangement is effective to prevent any trace of the treatment from being left in the second zone.
  • the step of inelasticizing the elastic members lying in the second zones further includes a step of fixing the elastic members lying in the second zones to the second zones and then cutting the elastic members lying in the second zones in such fixed state.
  • Such an arrangement is effective to prevent any trace of the treatment such as slits from being left in the second zone.
  • the step of inelasticizing the elastic members lying in the second zones includes a step of fixing the elastic members lying in the second zones to the second zones and then forming the second zones with a plurality of slits extending through the base sheet in the second zones.
  • Such an arrangement allows the slits along which the first and second waist regions to be torn off from each other for conversion of the pull-on type article to the open-type article to be simultaneously formed.
  • the step of fixing the elastic members to the second zones is achieved by means of adhesive intermittently applied on the web.
  • adhesive intermittently applied on the web.
  • chassis first or second (front or rear) waist region 13 second or first (rear or front) waist region 14 crotch region 17 base sheet 18 absorbent structure 19 elastic members (first elastic members) 20 elastic members (second elastic members) 21 fastener means 22 fastener means 23 intermediate zone 24 transversely opposite side edge zones 25 nonwoven fabric sheet 26 nonwoven fabric sheet 45 reinforcing layer 117 web 123 first zone 124 second zone 150 boundary line
  • a disposable diaper illustrated in Figs. 1 through 3 as a specific embodiment of the disposable absorbent article according to the invention has an absorbent chassis 10 comprising a front waist region 12, a rear waist region 13, a crotch region 14 extending between these waist regions 12, 13, and a pair of leg regions 14a defined by transversely opposite side edge portions of the crotch region 14.
  • the chassis 10 comprises a base sheet 17 and an absorbent structure 18.
  • the base sheet 17 has inner and outer surfaces 15, 16 and exhibits a relatively high flexibility and liquid-resistance and the absorbent structure 18 extends over the crotch region 14 further into the front and rear waist regions 12, 13.
  • the chassis 10 further comprises a plurality of elastic members 19 arranged in the front and rear waist regions 12, 13 as first elastic members, a plurality of elastic members 20 provided in the crotch region 14 along the respective leg regions 14a as second elastic members, and fastener means 21, 22 attached to the outer surface 15 of the base sheet along the transversely opposite side edge portions of the front waist region 12 and attached to the inner surface 15 of the base sheet 17 along the transversely opposite side edge portions of the rear waist region 13, respectively, so that the fastener means 21, 22 may be releasably engaged with each other.
  • an elasticized intermediate zone 23 containing the elastic members 19 arranged therein and inelasticized transversely opposite side edge zones 24 containing none of the elastic members 19 arranged therein are respectively defined (See Fig. 4 ) .
  • the front and rear waist regions may be connected with each other by mutual engagement of the fastener means 21, 22 when the diaper is put on a wearer's body. While the invention has been described above on the basis of the open type diaper as a specific embodiment, the structural features of this embodiment are applicable to a pull-on type diaper as will be described later as a third embodiment of the invention.
  • the base sheet 17 is formed from a laminate composed of two hydrophobic fibrous nonwoven fabric sheets 25, 26 intermittently bonded together and curving inward in the crotch region 14 so as to have its width reduced.
  • the base sheet 17 as a whole has an hourglass-like planar shape.
  • the nonwoven fabric sheets 25, 26 may be treated with repellent conventionally used for component materials constituting the article of the type as described herein if it is desired to enhance a liquid-resistant effect.
  • These nonwoven fabric sheets 25, 26 may be selected from those obtained by the methods of well known art for making various fibrous nonwoven fabric sheets and the component fibers of these nonwoven fabric sheets 25, 26 also may be selected from those conventionally used as the component fibers for the article of this type.
  • the elastic members 19, 20 are fixedly interposed between the nonwoven fabric sheets 25, 26 of the base sheet 17 and extend in a transverse direction. Though not illustrated, fixation of the elastic members 19, 20 is preferably achieved by hot melt adhesive intermittently applied in a spiral pattern, dotted pattern, or linear or curved stripe-pattern. Material for these elastic members 19, 20 may be natural or synthetic material so far as the material has a rubber elasticity.
  • the elastic members 19 are arranged over almost whole area defined between the vicinity of respective upper edges of the front and rear waist regions 12, 13 and the vicinity of respective upper edges of the crotch region 14 as viewed in Figs. 1 and 2 .
  • the elastic members 19a extending along an upper edge portion of a waist-hole are spaced apart one from another by a relatively small dimension and the elastic members 19b laid below the elastic members 19a are spaced apart one from another by a relatively large dimension.
  • both the elastic members 19a and the elastic members 19b so as to be spaced apart one from another by a uniform dimension, though no shown.
  • While a tensile stresses of these elastic members 19a, 19b may be appropriately set zone by each of zones in which these elastic members 19a, 19b are arranged, depending on a particular purpose for which the article is used, these tensile stresses are set, in general, so that the elastic members 19a arranged in the vicinity of the waist-hole present a relatively high tensile stress and the elastic members 19b arranged in the remaining zone present a relatively low tensile stress. This is for the reason that the elastic members 19a should function to hold the article on the wearer's body while the elastic members 19b should function as an auxiliary means to ensure a good fit of the article around the wearer's body. To ensure such functions, these elastic members are fixed preferably at least longitudinally opposite end portions thereof to the base sheet 17. In this way, the base sheet 17 is not formed with gathers as these elastic members contract and an external appearance is protected from being disordered.
  • the elastic members 19, 20 respectively have longitudinally opposite end portions 19c, 20a preferably laid in the vicinity of the inner side edges of the respective fastener means 21, 22 and oriented so as to cross these side edges.
  • the elastic members 19, 20 arranged in this manner are operatively associated or cooperate with each other through the intermediary of the fastener means 21, 22.
  • the contraction stress of the elastic members 19 is operatively associated with the contraction stress of the elastic members 20.
  • the fastener means 21, 22 function substantially in the same manner as those of well known under the trademark "Velcro” or "Magic Tape".
  • One of the fastener means 21, 22 comprises a hook member consisting of a hook-backing and a plurality of hooks protruding from one surface of the hook backing and the other of the fastener means 21, 22 adapted to be engaged with this hook member comprises a loop member consisting of a loop backing and a plurality of loops protruding or rising up out from one surface of the look backing.
  • These fastener means 21, 22 are made of material having a stiffness higher than the base sheet 17.
  • These fastener means 21, 22 may be replaced by pressure-sensitive adhesive applied directly or indirectly and continuously or intermittently on the chassis 10.
  • the term "applied indirectly on the chassis” means that an appropriate backing is coated with adhesive and this backing is bonded to the chassis 10 to form a fastener.
  • the fastener means comprising the loop member may be eliminated so far as the fibrous nonwoven fabric or the reticular fabric constituting the article can function as the loop member.
  • the fastener means 21, 22 may be fixed to the front and rear waist regions 12, 13 along the transversely opposite side edge zones thereof using hot melt adhesive and/or welding technique. Though not illustrated, such fixation is preferably made through the intermediary of a reinforcing layer 45 as will be described later with respect to a third embodiment of the invention.
  • the pressure-sensitive adhesive may be selected from those conventionally used in the technical field of this invention, for example, natural rubber-based adhesive or synthetic rubber-based adhesive such as acryl-based, silicone-based, or urethane-based adhesive. It is also possible to use, as the pressure-sensitive adhesive, natural latex mixed with one or more selected from the group consisting of SBR emulsion, IR emulsion, acrylic polymer, vinyl acetate, and ethylene/vinyl acetate copolymer in a given proportion.
  • a coating thickness of the adhesive is in a range of approximately 5 to 100 ⁇ m, preferably in a range of approximately 10 to 60 ⁇ m.
  • the fastener means 21, 22 preferably have tape-like shapes and continuously extend in a longitudinal direction of the chassis 10 over ranges substantially defined between longitudinally opposite ends of the front and rear waist regions 12, 13, respectively.
  • the rear waist region 13 or the front waist region 21 are stretched by the wearer's parent or care personnel with the transversely opposite side edge portions of this waist region held by the hands in order to put the article on the wearer's body, a tensile force for such stretching can be exerted on practically whole area of this waist region. Consequently, there occurs no anxiety that this waist region might be evenly or unevenly formed with gathers and prevented from coming in close and neat contact with the wearer's body.
  • the fastener means 21, 22 have a stiffness sufficient to maintain the shapes of the front and rear waist regions 12, 13. Therefore the fastener means 21, 22 can be easily put in mutual engagement and disengagement.
  • an alternative arrangement is also possible according to which the fastener means 21, 22 intermittently extend in the longitudinal direction of the article or a plurality of the fastener means 21, 22 extend in parallel one to another along each of the transversely opposite side edges so far as the effect as has been described a just above is achieved.
  • each of the fastener means 21, 22 in the illustrated embodiment may have a width dimension in a range of about 2 mm to about 30 mm and a length dimension in a range of about 50 mm to about 200 mm, preferably a width dimension in a range of about 5 mm to about 20 mm and a length dimension in a range of about 50 mm to about 150 mm.
  • Such dimensioning is effective to assure a sufficient peeling and shearing strength required for the fastener means 21, 22 particularly when these fastener means comprise the adhesive applied directly or indirectly on the chassis 10.
  • the absorbent structure 18 comprises a liquid-absorbent core 28, a flexible and liquid-pervious upper sheet 29 covering a top surface of the core 28 and a flexible and liquid-resistant lower sheet 30 covering a bottom surface of the core 28.
  • the upper and lower sheets 29, 30 respectively have portions 31, 32 extending outward beyond a peripheral edge of the core 28 and bonded together.
  • the absorbent structure 18 is provided along its transversely opposite side edges with a pair of flaps 33 having a relatively high flexibility, contractility and liquid-resistance.
  • Each of the flaps 33 has a proximal edge portion 34 fixed between the base sheet 17 and the portion 31, a distal edge portion 35 and longitudinally opposite end portions 36 which are folded inward and bonded in such a folded state to the upper sheet 29.
  • Each of the flaps 33 further has an elastic member 37 attached in a stretched state to the distal edge portion 35 so that the elastic member 37 may function as an elastic spacer means to space apart the flap 33 upward from the upper sheet 29 thereby forming a channel 38 adapted to receive body waste.
  • the core 28 comprises a mixture of fluff pulp and water-insoluble polymer particles having an absorption capacity corresponding to at least 20 times of its own weight, both components being well known in the art and appropriately compressed.
  • the core 28 is relatively stiff, i.e. , semirigid.
  • a general entirety of the core 28 is preferably wrapped with a liquid-absorbent/diffusible sheet such as tissue paper not only to achieve convenience for production of the article but also to prevent the core 28 from getting out of its initial shape and to prevent the polymer particles from falling off.
  • the upper and lower sheets 29, 30 are formed from nonwoven sheets.
  • Such nonwoven sheets may be selected from those obtained by various methods of well known art for making a fibrous nonwoven fabric and conventionally used as the component material for the article of the type described herein.
  • Fig. 5 shows the second embodiment distinguished from the first embodiment only with respect to the transversely opposite side edge portions of the rear waist region 13. More specifically, ear flaps 13A made of separately prepared material are connected to the transversely opposite side edge portions of the rear waist region 13 so as to form a part of the chassis 10 according to the second embodiment while ear portions on the transversely opposite side edge portions of the rear waist region 13 are integrally formed by the chassis 10 according to the first embodiment.
  • the ear flaps 13A are formed from a sheet material such as a fibrous nonwoven fabric having a tensile strength at least equal to the tensile strength of the base sheet 17 and preferably having a stiffness higher than the stiffness of the respective sheet materials constituting the base sheet 17.
  • the respective ear flaps 13A are connected to the chassis 10 along seaming lines 39 by heat-sealing or sonic-sealing proximal edge portions of the respective ear flaps 13A and the respective side edge portions of the chassis 10 with each other.
  • the ear flaps 13A are provided on the inner surfaces thereof with the fastener means 22.
  • Fig. 6 schematically illustrates a method for attaching the elastic members 19 to one of the front and rear waist regions 12, 13.
  • a continuous web 117 includes regions corresponding to a series of the front waist regions 12 or the rear waist regions 13 but remaining regions corresponding to a series of the other waist regions, the absorbent structure 18 and the leg-surrounding elastic members 20 are not illustrated.
  • a plurality of continuous elastic members 119 spaced apart one from another and extending in parallel one with another, all being stretched at a given ratio are fed onto the continuous web 117 destined to define the base sheets 17.
  • First zones 123 of the web 117 destined to define the intermediate zones 23 are coated with hot melt adhesive (not shown) while second zones 124 destined to define the transversely opposite side edge zones 24 are not coated with the adhesive.
  • the elastic members 119 are bonded to the first zones 123 by means of the adhesive coated thereon.
  • mechanical fasteners are attached to the web 117 or pressure-sensitive adhesive is directly or indirectly applied on the chassis 10 to form the fasteners.
  • each group of the elastic members 119 laid in the respective second zones 124 automatically contract or snap back.
  • the step of cutting is preferably carried out after the individual components have assembled in the form of the continuous web comprising the individual articles arranged side by side.
  • the front and rear waist regions 12, 13 of the absorbent chassis 10 and the side edge portions of the respective ear flaps 40 are overlapped and connected together by seam lines 41 extending along these side edge portions, whereupon a pull-on type diaper is formed with a waist-hole 42 and a pair of leg-holes 43.
  • the elastic members 19 extend beyond the intermediate zone 23 to the transversely opposite side edge zones 24 and these extensions of the elastic members 19 are cut into small segments in the longitudinal direction thereof through the base sheet 17 by a plurality of rows of slits 44 each extending intermittently in the vertical direction of the article and arranged in parallel one to another in the transverse direction of the article. In consequence, these segments of the elastic members in the transversely opposite side edge zones 24 have no more contractility.
  • the step of cutting the elastic members 19 is mechanically achieved in a mechanical using a sharp cutter.
  • the step of such cutting may be carried out using ultrasonic waves emitted from an ultrasonic wave apparatus comprising an anvil and a horn.
  • the ultrasonic wave treatment allows the elastic members to be cut or deteriorated without cutting the base sheet 17.
  • An equivalent effect may be obtained by coating the target regions of the base sheet 17 with hot melt adhesive and hardening the adhesive to make these target regions stiff.
  • the slits 44 function not only to deprive the elastic members 19 of contractility thereof but also to facilitate the front waist region 12 to be torn off from the rear waist region 13. Particularly in order to facilitate the front waist region 12 to be torn off from the rear waist region 13, at least the row of slits 44a adjacent the seam line 41 preferably extends from the upper edge to the lower edge of the front waist region 12.
  • Each of the reinforcing layers 45 has a sufficiently large contour size to cover a generally inner half of the side edge zone 24 on the outer surface of the front waist region 12 and the side edge portion of the intermediate zone 24.
  • the fastener means 21 are permanently bonded to these reinforcing layers 45 in the vicinity of the transversely opposite side edge zones 24 of the front waist region 12.
  • the ear flaps 40 are formed from a sheet material such as a fibrous nonwoven fabric having a tensile strength at least equal to the tensile strength of the base sheet 17 and preferably having a stiffness higher than the stiffness of the respective sheet materials constituting the base sheet 17. Unlike the embodiment as illustrated, it is also possible to form these ear flaps 40 integrally with the rear waist region 13 from the same material as that of the rear waist region 13.
  • the reinforcing layer 45 may be formed by bonding a sheet material having an appropriate strength and stiffness such as a fibrous nonwoven sheet or plastic film to the base sheet 17 using hot melt adhesive or welding technique such as heat- or sonic-sealing.
  • the base sheet 17 may be coated with hot melt adhesive and this hot melt adhesive may be hardened to form the reinforcing layer 45.
  • hot melt adhesive is preferably applied on the inner surface of the nonwoven sheet 25 constituting the base sheet 17.
  • These reinforcing layers 45 reinforce at least partially the regions in which the fastener means 21 are laid as well as the regions in which the slits 44 are formed and thereby effectively prevent the fastener means from being deformed and prevent the slit-formed regions from being broken. In this way, these reinforcing layers 45 stabilize the engagement between the fastener means 21, 22.
  • the article according to this embodiment can be easily converted to the open type diaper, if desired, merely by tearing the front waist region 12 off from the rear waist region 13 along the slits 44a serving as tear off guide.
  • first and second embodiments Deprivation of the elastic members 19 of contractility by the slits 44 as well as the formation of the reinforcing layers 45 may be adopted in the first and second embodiments. Furthermore, the features of the first, second and third embodiments may be appropriately combined to obtain an alternative embodiment not illustrated.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Claims (15)

  1. Absorbierender Wegwerfartikel umfassend,
    ein absorbierendes Chassis (10) mit einem ersten Taillenbereich (12);
    einen zweiten Taillenbereich (13), einen Schrittbereich (14), der sich zwischen diesen Taillenbereichen (12, 13) erstreckt;
    einen Beinbereich (14a), der sich in transversal gegenüber liegenden Seiten des Schrittbereichs erstreckt, wobei:
    von dem ersten und zweiten Taillenbereich (12, 13) zumindest der erste Taillenbereich (12) erste elastische Elemente (19) aufweist, die angepasst sind, in einer die Taille umgebenden Richtung eines Trägers zu wirken;
    die Beinbereiche zweite elastische Elemente (20) aufweisen, die angepasst sind, in einer die Beine umgebenden Richtung des Trägers zu wirken;
    der erste Taillenbereich (12) entlang seiner transversal gegenüber liegenden Seitenrandabschnitte Befestigungsmittel (21, 22) aufweist, die angepasst sind, lösbar miteinander in Eingriff zu stehen und dabei lösbar den ersten und zweiten Taillenebereich (12, 13) zu verbinden; dadurch gekennzeichnet, dass
    der erste Taillenbereich (12) einen elastischen Mittelabschnitt (23) und unelastische transversal gegenüber liegende Seitenrandabschnitte (24) aufweist, in denen die Befestigungsmittel (21, 22) an den ersten Taillenbereich (12) befestigt sind, wobei in den unelastischen Abschnitten (24) die Kontraktionsfähigkeit der elastischen Mittel in den Abschnitten (24) durch nachfolgende Behandlung beseitigt wurde.
  2. Artikel nach Anspruch 1, wobei die Befestigungsmittel (21, 22) an den ersten Taillenbereich in den transversal gegenüber liegenden Seitenrandabschnitten (24) durch das Zwischenlegen von Verstärkungslagen (45), die aus separat von dem ersten Taillenbereich bereitgestelltem Material gebildet sind, befestigt sind.
  3. Artikel nach Anspruch 1 oder 2, wobei das Chassis eine flexible und flüssigkeitsresistente Basislage (17) umfasst, die innere und äußere Flächen und ein an der inneren Fläche befestigtes, halbstarres absorbierendes Panel aufweist.
  4. Artikel nach Anspruch 3, wobei die Basislage (17) eine Laminatlage umfasst, die aus mindestens zwei intermittierend miteinander verklebten Lagen gebildet ist, und die ersten und zweiten elastischen Mittel (19, 20) sind zwischen den beiden Lagen eingelegt.
  5. Artikel nach zumindest einem der Ansprüche 1 bis 4, wobei die ersten elastischen Mittel (19) im Wesentlichen über einen gesamten Bereich des Mittelabschnitts (23) vorgesehen sind.
  6. Artikel nach zumindest einem der Ansprüche 1 bis 5, wobei die ersten und zweiten elastischen Mittel (19, 20) eine Vielzahl von faden- oder faserähnliche Mittel mit Gummi-Elastizität aufweisen.
  7. Artikel nach zumindest einem der Ansprüche 1 bis 6, wobei die Befestigungsmittel (21, 22) mechanische Befestiger oder Befestiger umfassen, die durch unmittelbar oder mittelbar auf das Chassis in dessen gewünschten Bereichen aufgebrachten Kleber gebildet sind.
  8. Artikel nach zumindest einem der Ansprüche 1 bis 7, wobei die Befestigungsmittel (21, 22) kontinuierlich oder intermittierend auf dem ersten Taillenbereich (12) über eine Erstreckung vorgesehen sind, die zwischen gegenüber liegenden Endabschnitten in vertikaler Richtung des Chassis bestimmt ist.
  9. Artikel nach zumindest einem der Ansprüche 1 bis 8, wobei die ersten und zweiten elastischen Mittel (19, 20) eine Vielzahl von elastischen Elementen umfassen und longitudinal gegenüber liegende Enden der elastischen Elemente sind in der Umgebung von Seitenrändern der Befestigungsmittel (21, 22) gelegt und ausgerichtet, diese Seitenränder zu kreuzen.
  10. Artikel nach zumindest einem der Ansprüche 1 bis 9, wobei der Artikel eine Windel des offenen Typs oder eine Höschenwindel ist.
  11. Verfahren zur Herstellung eines Artikels nach Anspruch 1, umfassend die Schritte eine Vielzahl von kontinuierlichen, elastischen, sich parallel und voneinander beabstandet erstreckenden Elementen (119) auf eine kontinuierliche Bahn zuzuführen, die bestimmt ist, individuelle Basislagen zu bilden, die das Chassis (10) bilden, um an einem ersten Abschnitt (123) der Bahn befestigt zu werden, der dem Mittelabschnitt entspricht, und die in zweiten Abschnitten (124), welche den transversal gegenüber liegenden Seitenrandabschnitten entsprechen, liegenden elastischen Elemente der Bahn unelastisch zu machen.
  12. Verfahren zur Herstellung des Artikels nach Anspruch 11, wobei der Schritt des unelastisch Machens der elastischen, in den zweiten Abschnitten (124) liegenden Elemente (119) ferner einen Schritt umfasst, bei dem die elastischen, in den zweiten Abschnitten liegenden Elemente an den zweiten Abschnitt befestigt werden und anschließend die elastischen, auf einer Grenzlinie (150) zwischen den zweiten Abschnitten aneinander entlang der Grenzlinie angrenzend liegenden Elemente durchgeschnitten werden, um die elastischen, in dem zweiten Abschnitt liegenden Elemente kontrahieren zu lassen.
  13. Verfahren zur Herstellung des Artikels nach Anspruch 11, wobei der Schritt des unelastisch Machens der elastischen, in den zweiten Abschnitten (124) liegenden Elemente (119) ferner einen Schritt umfasst, bei dem die elastischen, in den zweiten Abschnitten liegenden Elemente an die zweiten Abschnitte befestigt werden und anschließend die elastischen, in den zweiten Abschnitten in so befestigtem Zustand liegenden Elemente durchgeschnitten werden.
  14. Verfahren zur Herstellung des Artikels nach Anspruch 11, wobei der Schritt des unelastisch Machens der elastischen, in den zweiten Abschnitten (124) liegenden Elemente (119) ferner einen Schritt umfasst, bei dem die elastischen, in den zweiten Abschnitten liegenden Elemente an die zweiten Abschnitte befestigt werden und anschließend die zweiten Abschnitte mit einer Vielzahl von Schlitzen (44) versehen werden, die sich durch die Basislage in den zweiten Abschnitten erstrecken.
  15. Verfahren zur Herstellung des Artikels nach mindestens einem der Ansprüche 11 bis 14, wobei der Schritt des Befestigens der elastischen Elemente (119) an den zweiten Abschnitten (124) mittels intermittierend auf die Bahn aufgebrachten Klebers erreicht wird.
EP04771892.9A 2003-08-19 2004-08-19 Saugfähiger einwegartikel und herstellungsverfahren dafür Revoked EP1661538B1 (de)

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JP2003207952 2003-08-19
JP2004163419A JP4652724B2 (ja) 2003-08-19 2004-06-01 使い捨て吸収性物品及びその製造方法
PCT/JP2004/011931 WO2005016213A1 (ja) 2003-08-19 2004-08-19 使い捨て吸収性物品及びその製造方法

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EP1661538A1 EP1661538A1 (de) 2006-05-31
EP1661538A4 EP1661538A4 (de) 2009-05-27
EP1661538B1 true EP1661538B1 (de) 2013-04-24

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CN (2) CN1856285B (de)
BR (1) BRPI0413216A (de)
ES (1) ES2422413T3 (de)
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MY (1) MY142396A (de)
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US20090095403A1 (en) 2009-04-16
TW200522920A (en) 2005-07-16
ES2422413T3 (es) 2013-09-11
CN102038579A (zh) 2011-05-04
EP1661538A4 (de) 2009-05-27
CN1856285B (zh) 2010-11-10
US20050080394A1 (en) 2005-04-14
CN1856285A (zh) 2006-11-01
CN102038579B (zh) 2013-08-21
US8114058B2 (en) 2012-02-14
HK1087608A1 (en) 2006-10-20
RU2006108260A (ru) 2007-09-27
RU2325890C2 (ru) 2008-06-10
US8221376B2 (en) 2012-07-17
MY142396A (en) 2010-11-30
WO2005016213A1 (ja) 2005-02-24
JP2005095574A (ja) 2005-04-14
KR20060031703A (ko) 2006-04-12
TWI241907B (en) 2005-10-21
KR100779932B1 (ko) 2007-11-28
US20090105677A1 (en) 2009-04-23
BRPI0413216A (pt) 2006-10-03
JP4652724B2 (ja) 2011-03-16
EP1661538A1 (de) 2006-05-31

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